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Continuous desulfurization and bacterial community structure of an integrated bioreactor developed to treat SO_2 from a gas stream

查看全文 作　　者：Jian [1]Lin;Lin [1]Li;Wenjie [1]Ding;Jingying [1]Zhang;Junxin [1]Liu 高影响力作者 机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences高影响力机构 出　　处：《Journal of Environmental Sciences》索引2015年第27卷第11期,共9页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (No. 51221892);the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2010ZX07319-001-03) 摘　　要：Sulfide dioxide(SO2) is often released during the combustion processes of fossil fuels. An integrated bioreactor with two sections, namely, a suspended zone(SZ) and immobilized zone(IZ), was applied to treat SO2 for 6 months. Sampling ports were set in both sections to investigate the performance and microbial characteristics of the integrated bioreactor. SO2 was effectively removed by the synergistic effect of the SZ and IZ, and more than 85%removal efficiency was achieved at steady state. The average elimination capacity of SO2 in the bioreactor was 2.80 g/(m3·hr) for the SZ and 1.50 g/(m3· hr) for the IZ. Most SO2 was eliminated in the SZ. The liquid level of the SZ and the water content ratio of the packing material in the IZ affected SO2 removal efficiency. The SZ served a key function not only in SO2 elimination, but also in moisture maintenance for the IZ. The desired water content in IZ could be feasibly maintained without any additional pre-humidification facilities. Clone libraries of 16 S r DNA directly amplified from the DNA of each sample were constructed and sequenced to analyze the community composition and diversity in the individual zones.The desulfurization bacteria dominated both zones. Paenibacillus sp. was present in both zones, whereas Ralstonia sp. existed only in the SZ. The transfer of SO2 to the SZ involved dissolution in the nutrient solution and biodegradation by the sulfur-oxidizing bacteria.This work presents a potential biological treatment method for waste gases containing hydrophilic compounds. 关 键 词：一体化生物反应器 群落结构 脱硫细菌 集成 开发 生物处理方法 二氧化硫 SO2
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